To determine how many slots in the book may be filled with baseball cards, we first need to calculate the total number of slots in the book and then subtract the slots used for football cards.
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Total Pages in the Book: 54 pages
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Slots per Page: 9 slots
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Total Slots in the Book: \[ 54 \text{ pages} \times 9 \text{ slots/page} = 486 \text{ slots} \]
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Pages Used for Football Cards: 18 pages
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Slots Used for Football Cards: \[ 18 \text{ pages} \times 9 \text{ slots/page} = 162 \text{ slots} \]
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Slots Available for Baseball Cards: \[ 486 \text{ slots} - 162 \text{ slots} = 324 \text{ slots} \]
Therefore, the number of slots in the book that may be filled with baseball cards is 324 slots.